EP1247111B1 - A digital eddy current proximity system: apparatus and method - Google Patents

A digital eddy current proximity system: apparatus and method Download PDF

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Publication number
EP1247111B1
EP1247111B1 EP00988463A EP00988463A EP1247111B1 EP 1247111 B1 EP1247111 B1 EP 1247111B1 EP 00988463 A EP00988463 A EP 00988463A EP 00988463 A EP00988463 A EP 00988463A EP 1247111 B1 EP1247111 B1 EP 1247111B1
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EP
European Patent Office
Prior art keywords
impedance
probe
gap
proximity probe
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00988463A
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German (de)
English (en)
French (fr)
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EP1247111A2 (en
EP1247111A4 (en
Inventor
Rich Slates
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bently Nevada Inc
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BN Corp LLC
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Filing date
Publication date
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Publication of EP1247111A2 publication Critical patent/EP1247111A2/en
Publication of EP1247111A4 publication Critical patent/EP1247111A4/en
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Publication of EP1247111B1 publication Critical patent/EP1247111B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/202—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by movable a non-ferromagnetic conductive element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
EP00988463A 1999-10-22 2000-10-17 A digital eddy current proximity system: apparatus and method Expired - Lifetime EP1247111B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/425,830 US6346807B1 (en) 1999-10-22 1999-10-22 Digital eddy current proximity system: apparatus and method
US425830 1999-10-22
PCT/US2000/041257 WO2001029500A2 (en) 1999-10-22 2000-10-17 A digital eddy current proximity system: apparatus and method

Publications (3)

Publication Number Publication Date
EP1247111A2 EP1247111A2 (en) 2002-10-09
EP1247111A4 EP1247111A4 (en) 2005-12-21
EP1247111B1 true EP1247111B1 (en) 2008-12-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00988463A Expired - Lifetime EP1247111B1 (en) 1999-10-22 2000-10-17 A digital eddy current proximity system: apparatus and method

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US (18) US6346807B1 (US20020153880A1-20021024-M00005.png)
EP (1) EP1247111B1 (US20020153880A1-20021024-M00005.png)
JP (1) JP2003512609A (US20020153880A1-20021024-M00005.png)
AT (1) ATE417278T1 (US20020153880A1-20021024-M00005.png)
AU (1) AU2467001A (US20020153880A1-20021024-M00005.png)
DE (1) DE60041086D1 (US20020153880A1-20021024-M00005.png)
DK (1) DK1247111T3 (US20020153880A1-20021024-M00005.png)
WO (1) WO2001029500A2 (US20020153880A1-20021024-M00005.png)

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EP1247111A2 (en) 2002-10-09
US6847217B2 (en) 2005-01-25
US20030210039A1 (en) 2003-11-13
US6727688B2 (en) 2004-04-27
US20050104579A1 (en) 2005-05-19
US20020153880A1 (en) 2002-10-24
DE60041086D1 (de) 2009-01-22
US20030214283A1 (en) 2003-11-20
US6825676B2 (en) 2004-11-30
US20040176918A1 (en) 2004-09-09
US20030206002A1 (en) 2003-11-06
US6664782B2 (en) 2003-12-16
US6842020B2 (en) 2005-01-11
US20030206003A1 (en) 2003-11-06
US20030206004A1 (en) 2003-11-06
US20030210037A1 (en) 2003-11-13
US6703843B2 (en) 2004-03-09
US6954062B2 (en) 2005-10-11
US6798194B2 (en) 2004-09-28
US20030206005A1 (en) 2003-11-06
WO2001029500A3 (en) 2001-06-21
JP2003512609A (ja) 2003-04-02
US6919731B2 (en) 2005-07-19
US6346807B1 (en) 2002-02-12
DK1247111T3 (da) 2009-04-14
AU2467001A (en) 2001-04-30
US6906532B2 (en) 2005-06-14
WO2001029500A2 (en) 2001-04-26
US20030214282A1 (en) 2003-11-20
US6850078B2 (en) 2005-02-01
US6756794B2 (en) 2004-06-29
US6765395B2 (en) 2004-07-20
EP1247111A4 (en) 2005-12-21
US20030222639A1 (en) 2003-12-04
US6861852B2 (en) 2005-03-01
WO2001029500A9 (en) 2002-12-05
US20030206000A1 (en) 2003-11-06
US20030206001A1 (en) 2003-11-06
US6727687B2 (en) 2004-04-27
US20030206006A1 (en) 2003-11-06
ATE417278T1 (de) 2008-12-15
US6819122B2 (en) 2004-11-16
US20030210036A1 (en) 2003-11-13
US20030210038A1 (en) 2003-11-13
US6850077B2 (en) 2005-02-01

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